Crane



Patented Sept. 17, 1935 PATENT OFFICE cam Paul Wilsing, Duisburg,Germany,

assignor to Demag Aktiengesellschaft, Duisburg. Germany ApplicationNovember 18, 1932,'Serial No. 643,218 4 In Germany November 26, 1931 2Claims. (01. 21269) The invention relates to a lufling crane having afixed column and a bell casing rotatable about the column. According totheinvention a platform having the operator's stand and the driv- 5 ingmechanism mounted thereon is carried at the upper end of the rotatablebell casing, the jib being mounted at the lower end directly thereonupon thesaid casing; the operator thus has a wide view and can supervisethe driving mechanism, which is close beside him. The fixed column doesnot need to be any higherthan the bell casing, and the driving mechanismis disposed at a height above the ground or'supporting surface, a V factwhich is of importance in. connection with,

lufling cranes mounted on ships. The crane according to the invention issimple and effective in operation and needs only a single operator.

- Moreover, in the construction of crane according to the invention theplatform with the important driving and operating elements is disposedat the top end of the column and the advantage is secured that the craneoperator can see from his platform right to the bottom of the ship'shold and can keep his eye on the loading operations proceeding there.The cranes are adapted to be mounted near to the edges oi! the hatchway.I

In theusual constructions the crane operator frequently has his viewobscured by structures on the ship or by work people and whereas in the0 hitherto known features of ship's crane the operator of the crane cansee only close against the edges of the hatchway, he can now see wellbelow it and is positioned above the other work people 1 so that he cansee over them.

Again, the extension of the ship's crane rearwardly does not affectother ship structures or 'work people sothat thus the crane can turnwithout hindrance and without the fear being pres: cut that persons mayget-injured or goods damaged. The cranes are therefore speciallysuitable tor ships.

The invention is illustrated,- by way of exam 'ple, in the accompanyingdiagrammatic drawing.

Figure 1 is a side elevation of a Iufling crane according to theinvention.

5 Figure 2 is a corresponding plan, and

. Figure 3 is a vertical section through the 'plat-' form, on anenlarged scale.

As will be seen by reference to the drawing, a sleeve 2 is in the formof a bell inverted over the fixed column I, the sleeve 2 being suitablyheld at a distance from the column I at the upper and lower ends. Theplatform 2, which comprises a central part 3a and an outer part .31), ismounted i atthe upperendoithesleeve 2 (P1811183). The

luiiing jib 5 is pivotally connected at 4 to the sleeve 2; the mechanismfor efiecting rotation'is provided, as is the platform 3, at the-upperend ofthe column I. The platform 3a serves as a housing for the saidmechanism; the motor 6 of the r said mechanism is secured by a flangedirectly to the platform 3aand operates through a combined coupling andbraking combination I. The

toothed wheel transmission 8 acts on a toothed wheel 9 which is keyed atthe upper end of the 10 column I and is therefore stationary. Above thisstationary toothed wheel of the mechanism for efiecting rotation thereare provided the slip rings In for supplying current to the drivingmotors. The hoisting mechanism and the lufling mechanism which are'bothprovided with drums, are combined in a driving set in a particularmanner, that is to say, the two drums are disposed co-axially as shownin Figure 2. The hoisting motor ll operates the hoisting drum i3vthrough gearing which is provided in the gear casing l2. The hoistingcable 14 passes from the drum l3 to the pulley l5 at the end of the jib,thence to the return pulley I 6 and back to the jib pulley' II, fromwhichpoint it hangs in a vertical line weighted by the loadhook l8. Thedrum IQ of the drawing in or luiiing gear is driven by the lufling motorthrough gearing provided the casing 2|. The lufling gear and thearrangement and disposition of the parts of the crane are such that inluifing the load follows a horizontal path. The drums l3 and I 9, asalso the return pulley ii, are mounted upon a common shaft which issituated between the two casings I 2 and 2|, the drums l3 and is beingdriven through their respective gears. This common shaft may, forexample, be fixed and the two drums. will then be driven by aninternally-toothed pinion.

Y To render the shaftbearings accessible and capa ble of beingdismantled a multipartite ring 22 is provided between the two drums andif the parts of this ring be removed radially the drums can slide alongso that the axle bearings are exposed. The lufling cable .23, comingfrom the drum [9, is guided over the pulley 24 and back to any suitablepoint 25 in the casing l2.

The outerpart'of the platform may serve for the reception of controlmembers in the same way as the central part 30 of the platform is formedas gear casing. The platformis for this purpose in the form of acasingand may be divided up into a number of chambers, these chamberscontaining the controllers 26, 21 and 28 as well as the resistances 29.In the present case the crane operates with a to and fro switch mech- 5pivoted to sold rototable column, a. plottom uponbelnclufledJufllmmeehmimeomprlslng 'forzmdlnctheloedlnahorhontelpothandtheroiateble oolumnabove the pivotal exls otthehmnzjlbprovldedatthefo'rwnrdsldevlthnreoesslntowhlchthejlbmybeteoelvedwhen moon:

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